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Industrial water replenishing and deoxidizing system and method for low-pressure cylinder cutting unit

A technology of replenishing water system and low-pressure cylinder, which is applied in the direction of separation method, supplementary water supply, chemical instruments and methods, etc., which can solve the problems of high superheat degree of middle exhaust steam, increase of heat load of condenser, influence of heat recovery effect, etc., and achieve elimination Supercooling, increasing the inlet water temperature, and avoiding the effect of poor oxygen removal effect

Active Publication Date: 2022-04-26
DONGFANG TURBINE CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The middle row extracts steam to make up the condensed water for bubbling and deoxygenation. Due to the high degree of superheat of the middle row steam, when exchanging heat with the condensed water in the hot well, a large amount of boiling occurs in the cooling water in contact with the steam. The steam generated by the boiling The thermal resistance is very large. On the one hand, it seriously affects the heat recovery effect; on the other hand, part of the steam is directly discharged into the vapor phase space above the hot well in the form of bubbles, which increases the heat load of the condenser accordingly, and this part of the heat is eventually circulated. The water is taken away, resulting in poor economy of the unit. At the same time, the steam carried in the condensed water enters the condensate pump through the pipeline, which is more likely to cause cavitation of the condensed water pump, which brings safety risks to the operation of the unit.

Method used

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  • Industrial water replenishing and deoxidizing system and method for low-pressure cylinder cutting unit

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Embodiment 1

[0033] An industrial water replenishment and oxygen removal system for a low-pressure cylinder cutting unit, such as figure 1 As shown, it includes a low-pressure cylinder 2 and a medium-pressure cylinder 1, the low-pressure cylinder 2 is connected with a condenser 3, the exhaust steam of the medium-pressure cylinder 1 is connected with a deaerator 4, and the deaerator 4 is also connected with a The first heater 6 is connected to the condenser 3, so that the unit can use the condensed water in the condenser 3 to enter the deaerator 4 to exchange heat with steam and enter the Turbine water supply system;

[0034] It also includes an industrial water replenishment system 8, the industrial water replenishment system 8 communicates with a second heater 7, the condenser 3 is provided with a deaeration nozzle assembly 9, and the second heater 7 communicates with the deaeration nozzle assembly 9, The make-up water provided by the industrial make-up water system 8 is used for oxygen ...

Embodiment 2

[0046] An industrial water supplement and deoxygenation method for a low-pressure cylinder with 2 cylinder-cut units, which adopts the industrial water supplement and deoxygenation system for a low-pressure cylinder with 2 cylinder-cut units in Embodiment 1, comprising the following steps:

[0047] a. Under the operating condition of cutting cylinders, the low-pressure cylinder 2 has no exhaust steam, and the exhaust steam of the medium-pressure cylinder 1 provides heating to the deaerator 4 and the first heater 6 through the deaerator pipeline 11 and the steam extraction pipeline 12 respectively. steam;

[0048] b. The condensed water of the hot well of the condenser 3 enters the condensed water pump 5 through the condensed water pipeline 15 of the condenser, and then enters the first heater 6 through the condensed water pipeline 16 after the condensed pump. After the condensed water absorbs the heat of steam extraction, the temperature rises High, and then enter the deaerato...

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Abstract

The invention discloses an industrial water replenishing and deoxidizing system and method for a low-pressure cylinder cutting unit, and belongs to the technical field of industrial water replenishing and deoxidizing systems for steam turbine cylinder cutting units. The system comprises a low-pressure cylinder and an intermediate-pressure cylinder, the low-pressure cylinder is connected with a condenser, steam exhaust of the intermediate-pressure cylinder is connected with a deaerator, the deaerator is further communicated with a first heater, and the heater is communicated with the condenser. Condensed water in the condenser enters the deaerator to exchange heat with steam and enters a steam turbine water supply system when the unit is in a cylinder switching operation condition. According to the invention, the temperature of the condensed water is increased by utilizing the intermediate discharge steam extraction, the inlet water temperature of the deaerator is increased, meanwhile, the temperature of the condensed water condensed in the heater is further reduced by utilizing the built-in drainage cooling section of the heater, then the condensed water is introduced into the water-water heat exchanger to heat industrial replenished water, and then the condensed water is discharged to the condenser for flash evaporation, so that thermal deaeration is realized; drain water of the heater is discharged into the lower portion of a condenser hot well to reheat condensed water again, the supercooling degree is eliminated, and the best effect of deoxygenization of the condenser is achieved.

Description

technical field [0001] The invention relates to an industrial water replenishment and deoxygenation system and a deoxygenation method for a low-pressure cylinder cutting unit, and belongs to the technical field of the industrial water replenishing and oxygen removal system for a steam turbine and cylinder cutting unit. Background technique [0002] After the industrial steam supply unit cuts off the low-pressure cylinder of the steam turbine, the large-flow industrial extraction steam will not return to the condensate water system. The condensate water system needs to replenish a large amount of chemical water. The temperature of the chemical water is low and the oxygen content is very high. There is no exhaust steam heating of the steam turbine after the unit, and the oxygen removal effect is poor. The condensed water entering the recuperation system has a very high oxygen content, which brings a huge risk to the safe operation of the unit. At the same time, after the low-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/32F22D1/50F22D11/06
CPCF22D1/32F22D1/50F22D11/06
Inventor 阳欧刘经武颜强高晓亮姬艳云李开旺房媛文圆圆黄彪刘雄钟刚云
Owner DONGFANG TURBINE CO LTD
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